Supply air terminal device

Abstract

A fresh airflow is conducted from a supply air chamber through nozzles into a ring-shaped mixing chamber. A circulated airflow is conducted from a room space into a cylindrical suction chamber inside a ring-shaped heat exchanger. From the suction chamber the circulated airflow travels through the heat exchanger into the mixing chamber. The nozzles are located in the upper part of the mixing chamber at a distance from each other on the periphery of at least one circle, whereby the mid-point of the circle is located on the vertical central axis of the supply air terminal device. The horizontal component of the direction vector of the fresh airflow discharging from each nozzle forms an angle β, which is in a range of 45-135 degrees, with the radius of said at least one circle, and the direction vector is directed downward, in relation to the horizontal plane at an angle α, which is in a range of 15-75 degrees, whereby a rotating airflow directed downward is formed in the mixing chamber.

The invention claimed is:  
     
       1. A supply air terminal device, comprising:
 a cylindrical side wall, 
 a ring-shaped heat exchanger, which is located inside the cylindrical side wall, at a distance from the cylindrical side wall, 
 a cover plate, against which the top ends of the cylindrical side wall and of the ring-shaped heat exchanger are supported, 
 a ring-shaped mixing chamber arranged in a space between the cylindrical side wall and the ring-shaped heat exchanger, whereby the cylindrical side wall forms a cylindrical outer side wall of the mixing chamber, the outer periphery of the heat exchanger forms a cylindrical inner side wall of the mixing chamber, and the cover plate forms a roof plate of the mixing chamber, 
 a vertical central axis, 
 nozzles, which are placed in the upper part of the mixing chamber at a distance from each other on the periphery of at least one circle, whereby the mid-point of the at least one circle is located on the vertical central axis of the supply air terminal device, 
 a supply air chamber, from which a fresh airflow is conducted to the nozzles, 
 a bottom plate, which comprises at least a section of a periphery, in which there are an inner periphery of the bottom plate and an outer periphery of the bottom plate, 
 a ring-shaped output opening, which is located in the lower part of the mixing chamber and which comprises an inner periphery of the ring-shaped opening and an outer periphery of the ring-shaped opening, and 
 a cylindrical suction chamber arranged in a space limited by the inner periphery of the heat exchanger and into which circulated airflow is drawn from an air-conditioned room space and from which the circulated airflow travels through the heat exchanger into the mixing chamber, wherein in the mixing chamber the fresh airflow and the circulated airflow form a combined airflow, 
 wherein the nozzles are placed on the periphery of said at least one circle in such a way that the horizontal component of the direction vector of the fresh airflow discharging from each nozzle forms an angle, which is in a range of 45-135 degrees, with a radius of said at least one circle where each nozzle is placed, and the direction vector is directed downward in relation to a horizontal plane at an angle a, which is in a range of 15-75 degrees, causing a rotating combined airflow directed downward to form in the mixing chamber and a ring-shaped output opening of the mixing chamber is configured to guide the rotating combined airflow to discharge the airflow sideways in the direction of the ceiling into the air-conditioned room space. 
 
     
     
       2. The supply air terminal device according to  claim 1 , wherein the supply air chamber is defined:
 by a lower section arranged around the cylindrical outer side wall of the mixing chamber and inside the outer side wall of the supply air chamber, wherein the outer side wall of the supply air chamber is located outside and at a distance from the cylindrical outer side wall of the mixing chamber, and 
 by an upper section arranged above the cover plate, so that an outer cover plate of the supply air chamber includes a round outer cover plate located above the cover plate and at a distance from the cover plate, wherein the round outer cover plate is configured to close the top end of the cylindrical outer side wall of the supply air chamber. 
 
     
     
       3. The supply air terminal device according to  claim 1 , wherein
 a peripheral section of the bottom plate comprises a conical outer periphery, which forms the inner periphery of the ring shaped output opening, 
 the cylindrical outer side wall of the mixing chamber comprises a conical lower part, which forms the outer periphery of the ring shaped output opening, 
 whereby the ring-shaped output opening guides the combined airflow discharging from the mixing chamber sideways in the direction of the ceiling into the air-conditioned room space. 
 
     
     
       4. The supply air terminal device according to  claim 2 , wherein the bottom plate comprises an inner central section of the peripheral section of the bottom plate, in which there are openings, through which circulated airflow may travel from the air-conditioned room space into the suction chamber. 
     
     
       5. The supply air terminal device according to  claim 4 , wherein the central section of the bottom plate includes a round perforated plate, which is removable. 
     
     
       6. The supply air terminal device according to  claim 2 , wherein at least one of the central part of the cover plate and the outer cover plate of the supply air terminal device includes a section comprising at least one opening and through which circulated air travels from the air-conditioned room space into the suction chamber. 
     
     
       7. The supply air terminal device according to  claim 3 , wherein the outer periphery of the peripheral section of the bottom plate has an elliptical shape, whereby the output opening of the mixing chamber has an elliptical shape.